Power spectrum tomography of dark matter annihilation with local galaxy distribution

摘要: Cross-correlating the gamma-ray background with local galaxy catalogs potentially gives stringent constraints on dark matter annihilation. We provide updated theoretical estimates of sensitivities to annihilation cross section from data Fermi telescope and 2MASS catalogs, by elaborating power spectrum astrophysical backgrounds, adopting Markov-Chain Monte Carlo simulations. In particular, we show that taking tomographic approach dividing into more than one redshift slice will improve sensitivity a factor few several. If halos contain lots bright substructures, yielding large boost (e.g., $\sim$100 for galaxy-size halos), then may be able probe canonical thermal production mechanism up masses $\sim$700 GeV. Even modest substructure $\sim$10 other hand, could still reach three larger tens hundreds